"A brown or black streak on a nail is known ... It should be noted, however, that not all discoloration of the nails is due to fungus. Nail discoloration, on the other hand, refers to any marks ...

A 24-year-old white male presented with a 2-year history of changes to his nails. He stated that the white discoloration had never completely resolved but improved from time to time with the nails ...

The fungus appears on the toenail as a yellowish, white, or yellowish-brown discoloration, or the center of the toenail might have yellowish streaks. Jagged or chipped nails may eventually lift ...